Method of uniting by cementation.



I 110 Drawing.

' METHOD OF UNITING BY GEMENTATION.

To all whom it may concern:

Be-it known that I, WILLIAM HosKINs, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Methods of- Uniting by Cementation, of which the following is a specific'ation.

. In the process of cementing together sheets or pieces of.,the same or different materials, as, for example, in veneering or in the production of multiple-ply wood or paper board, etc, it has hitherto been the universal practice to coat one or both of the surfaces to be joined with a cementing substance rendered preliminarily. fluid, either by being molten or dissolved in liquid, after which the surfaces were held together under pressure until the cementing substance dried. In the use of most, if not all, of the cementing substances thus applied, it is necessary, or at. least desirable, that the surfaces to be joined shall-be primarily dry, as the pres: ence of surplus moisture would interfere with the proper union of the cement with v the surfaces. Therefore, in the manufacture of multi le-ply board of good quality "from sheets o veneer, in the manner stated,

i it is necessary that, the veneer after being cut shall be thoroughly dried.

One, of my principal objects is to provide a method of cementing together sheets of l water, butwhich when subjected, in the presence of moisture, to a temperature apsubstance described is provided in finelyproximatingor exceeding the boiling point of water, becomes viscous and cementitious in character, and when subsequently dried operates as an effective agglutinant.

.-I n the manufacture of multiple-ply board from. veneer, forfe'xample, the cementing Specification of Letters Patent.

surplus moisture to evaporate.

Patented Got. 15, 1912.

' Application filed June 7, 1911. Serial No. 631,828

divided condition and. applied in a thin layer, and unheated state, to one or each of the meeting surfaces of the veneer sheets.

Preferably the sheets are wet whenthe cementing substance is'applied, but if. they have dried out for any reason so that they do not contain suflicient moisture for the cementing, substance then of course the sheets may have the necessary additional moisture supplied to them in any desired way. The sheets are then placed together with the layer of undissolved particles of cementing substance between them and subjected to pressure and heat at a temperature, say 300 F., which will cause the ce- Inenting substance to become sticky and the In a very short time the veneer and agglutinant become dry and the latter operates to cement the sheets firmly together. Thus, for ex ample, multiple-ply veneer-board may be manufactured much cheaper and quicker than by the old process.

My improved method of cementing sur-- faces together may be employed with benefit in other connections besides that of the manufacture of multiple-ply veneer-board, and the foregoing description is intended merely to convey a clear understanding of my invention in one useful application. No undue limitation should be understood therefrom, asit is my intention to claim alt that is novel in my invention and that the claims shall be construed as broadly as the prior state of the art may warrant.

What 'I claim as new and desire to se cure byLetters Patent is 1. The process of assembling parts together, which consists in supplying a moist part, applying thereto a powdered cementitious substance substantially insoluble in water except in the presence of heat, applying them to pressure and heat whereby the moist part under the influence of the heat dissolves the powdered rawhide and causes absorption thereof by the parts, the powdered rawhide to the extent of the moisture required to dissolve it assisting the action of the heat in drying the moist part.

3. The process of assembling veneer, which consists in supplying a moist veneer, applying thereto a powdered cementitious substance substantially insoluble in water except for the presence of heat, applying a second layer of veneer and subjecting them to pressure and heat whereby the moisture in the wet veneer under the influence of the heat dissolves the cementitious substance and causes absorption thereof by the veneer, the cementitious substance to the extent of the moisture required to dissolve it assisting the action of the heat in drying the veneer.

4. The process of assembling veneer, which consists in supplying a moist veneer, applying thereto powdered rawhide, applying a second layer of veneer and subjecting them to pressure and heat whereby the moisture in the wet veneer under the influence of the heat dissolves-the rawhide and causes absorption thereof by the veneer, the rawhide to the extent of the moisture required to dissolve it assisting the action of the heat in drying the veneer.

WILLIAM HOSKINS.

In presence ofl i J. G. ANDERSON, R. A. SCHAEFER. 

